摘要
利用 CCD摄像机的线性时间积分成像机理 ,将数字图像处理技术与时间平均成像方法结合用于测量各态历经随机振动的幅值统计特征。该测量方法只需摄取被测点在静态下的图像及其在随机振动状态下的一组连续的时间平均成像即可确定该点振动的位移动态范围、均值、均方值、方差和幅值概率密度曲线。该方法测量频率范围宽 ,对测量设备和实验条件的要求很宽松。
Based upon the linear integral imaging mechanism of the CCD camera and combined time average imaging and digital image processing techniques,this paper presented a new method to measure the statistics of random vibrations in the amplitude domain.In this method,only the image of measured point in its static state and a set of its time average images captured in its random vibration state are needed for determining the dynamic range,mean value,mean square value and probability distribution of the point in an ergodic random vibration.The method possesses triple advantages of being simple in equipment,wide of measuring frequency range and high in accuracy.
出处
《振动．测试与诊断》
EI
CSCD
2000年第1期24-29,共6页
Journal of Vibration,Measurement & Diagnosis
关键词
随机振动
时间平均成像
CCD
振幅
图像测量
random vibration non contact measurement time average imaging digital image processing CCD
